ABB SACE PR122/P-LSIG Electronic Trip Unit

Overview

ABB SACE PR122/P-LSIG is an electronic overcurrent trip unit for the ABB SACE Emax series air circuit breaker. LSIG stands for Long time, Short time, Instantaneous and Ground fault protection functions. It is installed on Emax E1/E2/E3/E4/E6 series ACBs for low-voltage main distribution and feeder protection. This ABB SACE PR122/P-LSIG is widely stocked as spare trip unit for ABB Emax low voltage power distribution assemblies.

Features

ABB PR122/P-LSIG Trip Unit provides four adjustable protection curves: long time overload protection, short time delayed short-circuit protection, instantaneous short-circuit protection and ground fault protection. Each protection threshold and time delay can be set locally via the front panel or via ABB Ekip Connect software.PR122/P-LSIG is equipped with LCD display, local keypad, metering function and fault event recording. It measures voltage, current, power, energy and harmonic values. It stores trip history, fault type and fault current data for post-fault analysis. This trip unit supports optional communication modules for Modbus, Profibus and other fieldbus protocols to upload data to DCS and SCADA systems. It has built-in self-test, CT supervision and trip circuit supervision. It supports fixed and withdrawable Emax breaker versions, complies with IEC 60947-2 standard. It is designed for 24/7 continuous operation in power plants, data centers, petrochemical and industrial main switchboards.

Specifications

ABB SACE PR122/P-LSIG Electronic Trip UnitBrand: ABB Series: SACE Emax Model: PR122/P-LSIG Type: electronic protection trip unit Protection functions: L: Long time overload S: Short time delay short circuit I: Instantaneous short circuit G: Ground fault Compatible breaker: Emax E1, E2, E3, E4, E6 Sensor rating: matched with breaker In Display: LCD graphic display Measurement: current, voltage, power, energy, harmonics Data record: fault log, trip event storage Configuration: front keypad, Ekip Connect Communication: fieldbus module optional Standard: IEC 60947-2 Protection class: IP40 front face Ambient temperature: -10℃ ~ +60℃ Status: classic active spare for Emax ACB

Principle

ABB SACE PR122/P-LSIG samples current signal from built-in current transformers inside the air circuit breaker. This Electronic Trip Unit evaluates current magnitude and duration against the configured protection settings. When overload, short-circuit or ground fault exceeds threshold, the unit sends trip command to the breaker shunt trip coil to open the main contacts. It records fault data and sends alarm status to monitoring systems.

Applications

ABB SACE PR122/P-LSIG is deployed in industrial main LV switchboards, power station auxiliary power systems, data center power distribution, commercial building main incoming and bus tie circuits. It is the core protection and metering unit for ABB Emax air circuit breakers. ABB SACE PR122/P-LSIG is stocked as spare electronic trip unit for SACE Emax power distribution assemblies.